Delete row sig_4b575144a6b0 from signals

id sig_4b575144a6b0
event_id evt_83059820a6f7
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_4c1142ca1 ...
dedupe_key signal_enriched:news_delta:7d88354ad6a3715d
throttle_s 0
created_at 2026-04-11T10:31:21.435982+00:00
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